haha.. i was just browsing thru wikipedia and i came across a section on 'YO MAMA'!!!

its apparently a afro tradition... check out the entry here: yo mama jokes!

its really damn funny.. if u scroll down, u'd get to see things like:

Yo' momma's so fat...

she uses a lawnmower to shave her legs
when she swims in the ocean, some one shouts, 'Free Willy!'
she's got more rolls than a bakery

Yo' momma's so stupid..

she bought a tape on how to fix a VCR
when she drove to the airport, and saw the sign 'Airport Left' she turned around and went home

Yo' momma's such a slut...

she walks around with a mattress on her back

Yo' momma's so ugly

When she was born the doctor took one look at her and slapped her mother.
She entered an ugly contest and got turned away, because they told her "Sorry, no Professionals"

and other than all these funny stuff.. there is uncyclopedia! parody to wiki of course.. and its really quite funny too:

Singapore
OPRAH (this one is a MUST SEE!! haha)